Continuous coating wiper apparatus



Oct. 24, 1933. R. F. RENKIN CONTINUOUS COATING WIPER APPARATUS 3shets-sheet 1 Filed March 22, 1935 Oct. 24, 1933. R. F. RENKINCONTINUOUS COATING WIPER APPARATUS 3 sheets-sheet 2 Fild Mach 22, 1935BY Y? Oct. 24, 1933. R. F. RENKIN CONTINUOUS COATING WIPER APPARATUSFiled March 22, 1953 fl 5 T lNvENToR 3 Sheets-Sheet 3 Fly: 8

Patented Oct. 24, 1933 i UNITED VSTATES CONTINUOUS coATiNG WIPERAPPARATUS y Robert F. Renkin,

Sharon, Pa.,

assigner to Sharon Steel Hoop Company,` Sharon, Pa., a corporation ofPennsylvania Application March 22, 1933. Serial No. 662,055

17 Claims.

The invention relates to the continuous coating of metal strips and thelike with a hot metallic protective coating; and more particularly to awiper apparatus utilized for wiping off excess coating material whichmay adhere to the surfaces of a strip passing continuously through amolten bath in a coating pot, immediately after the strip issues fromthe molten bath, in order to provide a smooth, even and uniform coatingon the surfaces of the strip.

The hot coating of metallic material as by galvanizing, tinning and thelike, involves the passing of material to be coated through a moltenbath of zinc, lead, tin, aluminum, or the like, or various combinationsof the same, 'and usually, the immediate wiping of excess coatingmaterial from the surfaces ofthe material coated.

The molten bath is relatively hot, and consequently when a wipingoperation is performed,

1 the excess material being wiped from the surfaces of the coatedmaterial is hot; as is also the material being coated, due to itsimmersion in the molten bath. For these reasons it has been the practiceto utilize asbestos, rubber and 'other Vtypes of wiper pads inperforming the wiping operation. `However, wiper pads rapidly wear downand must be replaced frequently in order that a uniformly coated productmay be obtained. The wiper pads may be replaced without difficulty whensheet material is being coated, because it is vonly necessary to delaythe feed of sheets to the coating pot for a short time in order toaccomplish a wiper pad change over.

On the other hand, difculties are encountered in replacing the usualwiper pads of a coating Wiper apparatus when strip material is beingcoated. The difficulties arise because strip material is always pulledin a continuous manner at a uniform speedthrough the molten bathbecausethe strip material in the bath will burn ,if the continuous, uniformmovement of the same is delayed or stopped while the wiper pads arechanged,| and because a section of the strip will not be wiped, andtherefore will not be uniform with the remainder of the strip, if themovementof the same is continued while wiper pads are removed and newones' placed in operative position.

It is therefore an object of the present invention to provide wiperapparatus for use in connection with the hot coating of continuousstrip' material, in which the wiper pads may be changed without delayingor stoppingy the continuous movement of material through the coatingpot, and substantially without leaving a section of the strip v Hotcoating pots for coating continuous strips are provided withsubstantially horizontally located hold-down rollsunder which thecontinuous `strip passes in moving continuously through the molten bathin the pot. These hold-downrolls are subject to corrosion, wear and thelike, because of their immersion in the molten bath and must thereforebe resurfaced or renished from time to time. For these reasons, it isdesirable, if not necessary, to provide for adjusting the location ofthe axesof the hold-down rolls both vertically and horizontally, inorder to accommodate the rolls to the desired path of travel of thecontinuous Astrip moving `'through the coating pot.

These adjustments to 'the hold-down rolls require similar adjustments tobe made for properly locating the wiper apparatus with respect to thehold-down rolls, so that it is also necessary to provide for verticaland horizontal adjustment of the wiper apparatus.

It is therefore a further'object of the present invention to providechangeable hot coating wiper apparatus for continuously moving strip'material with means for adjusting the wiper api paratus vertically andlhorizontally to accommodate the same to the desired'path of travel ofthe strip and to compensate for hold-down roll wear.

The thickness and uniformity of the coating on hot coated materialpassed through a molten bath is controlled or determined in part by theamount of balanced pressure which is exerted by the wiper pads upon thesurfaces of the material, during the wiping operation.

Accordingly, 'it is an object of the present invention to providechangeable hot coating wiper apparatus for continuously moving stripmaterial with means for adjusting the balanced pressure exerted by thewiper pads upon Vthe surfaces of hot coated material passingtherebetween, to obtain a uniform coating having the desired thickness,and to compensate for wiper pad wear.

Strip material is rolled in many different widths and the hot coating ofstrip material may be most economically carried out if the coating yandwiping apparatus is adapted for receiving different widths of stripsasvby providing a coating pot and removable wiper apparatus for hotcoating .and wiping a selected stripfwidth, and by providing additionalWiper apparatus whichV may be substituted for the wide strip wiperapparatus for wiping a plurality of narrower strips passedk in parallelthrough the coating pot.

It is therefore a further object of the present invention to provide hotcoating wiper apparatus for simultaneously -wiping a plurality of stripspassed in parallel through a coating pot, and to provide said apparatuswith means for independently adjusting the location of and pressure ofeach individual strip wiper.

And finally, it is a further object of the presc nt invention to providea compact, simple, inexpensive and readily controlled and repaired wiperapparatus having the aforesaid advantageous characteristics.

These and other objects may be obtained by the apparatus, combinations,parts, elements and devices, preferred embodiments of which are shown inthe drawings and are hereinafter de-` scribed in detail and claimed,which may be stated in general terms as including in continuous coatingwiper apparatus for a hot coating pot, a frame, means for levelling andclamping the 4frame on the coating pot, means for. horizontallyadjusting and clamping the frame on the coating pot, a wiper roll memberjournaled in the frame, a movable carriage mounted in the frame, asecond wiper roll member journaled on said carriage, each. of said wiperr'oll members being provided with a plurality of rib` members, wipermembers for the rib members, said wiper and rib members being providedwith interengaging means removably mounting the wiper members on the ribmembers, a removable wiper pad carried by each wiper member, meanspreventing rotation of each wiper roll in one direction, and means foradjusting said carriage to and away from the rst mentioned wiper roll.

In the drawings:-

Figure 1 is a plan View of a continuous strip coating pot equipped withthe improved continuous coating wiper apparatus;

Fig. 2 is a side elevation of the apparatus shown in Fig. 1, partlyinsection, as on the line 2 2, Fig. 1;

Fig. 3 is lan enlarged fragmentary plan View, parts being broken awayand in section, of the improved Wiper apparatus shown in Figs. 1 and 2;

Fig. 4 is a transverse section of the parts shown in Fig. 3, taken onthe line 4 4, Fig. 3;

Fig. 5 is a longitudinal section of the parts shown in Fig. 3, taken onthe line 5 5, Fig. 3;

Fig. 6 is a side elevation of the improved coating wiper apparatus shownin Fig. 3;

Fig. 7 is a view, similar to Fig. 3, of a modified form of improvedcoating wiper apparatus for wiping two continuous strips passed inparallel through a coating pot;

Fig. 8 is a view, similarv to Figs. 3 and 7, of a further modif-led,form of improved coating wiper apparatus for wiping three continuousstrips passed in parallel through a coating pot; and' Fig. 9 is afragmentary sectional view through the improved wiper rolls, wipermembers and wiper pads, taken on the line 9 9, Figs. 3, 7 and 8.

Similar numerals refer to similar parts throughout the drawings.

Any suitable form of coating pot or tank generally indicated at 10 maybe utilized in carrying out the present invention, and the pot 10 mayinclude a setting 11a liner 12 and suitable heating means indicatedgenerally at 13 for maintaining a molten bath 14 of suitable coatingmaterial at the proper temperature within the pot 10.

The coating apparatus illustrated is adapted for the coating ofcontinuous strip material indicated at S, which may be pulled throughthe coating pot 10 from any suitable source, not shown. The strip S rstpasses over an entry roll 15 journaled in suitable bearing blocks 16mounted on the pot 10.` The strip S then passes into the molten -bath14, contained within the pot 10, under hold down rolls 17 journaled onhold down roll arms 18, which are carried by hold down roll supports 19mountedon the coating pot 10.

A plurality of adjusting blocks 20 and 20a are mounted on the coatingpot10 adjacent to each'` hold down roll support 19, in which blocks 20 and20a are threaded adjusting screws 21.y The inner ends of the adjustingscrews 21 engage the hold down roll supports 19 so that the position ofthe supports 19, and therefore of the hold down rolls 17 carriedthereby, may be adjusted to accommodate the rolls to the desired path oftravel of the continuous strip S moving through the bath 14 in thecoating pot. When adjusted, the screws 21 may be clamped in adjustedposition by the lock nuts 22.

Means is also provided for locating and adjusting the supports 19 in thedesired vertical position with respect to the coating pot 10, preferablyby providing levelling screws 23 which are threaded through the supports19 and engage the upper flanged portion l2 of the liner 12; and byproviding bolts 24 connected to the flange 12', and nuts 25 therefor,which bolts 24 extend through slots 26 provided in the supports 19. Theslots 26 enable the supports 19 to be laterally adjusted by theadjusting means 2l 22 and to then be clamped in levelled position by thenuts 25 after the levelling screws 23 have been set at the desiredplace.

Referring more particularly to Figs. 3, 4, 5 and 6, wherein a singlestrip wiper apparatus is shown, the wiper apparatus preferably includesa wiper frame composed of longitudinal end members 27 and lateral endmembers 28, preferably bolted together as at 29 and 30, and roll framemembers 31 are connected to the frame members 28 preferably by bolts 32.

A plurality of adjusting blocks 20h are mounted on the coating pot 10adjacent to the wiper frame, and adjusting screws 33 are threaded intothe blocks 20a and 20h. The innerends'of the adjusting screws 33 engagethe wiper frame members 28 so that the position of the frame may beadjusted to accommodate the wiper apparatus to the desired path oftravel of the continuous strip S being wiped thereby. When adjusted, thescrews 33 may be clamped in adjusted position by the lock nuts 34.v

Means is also provided for locating and adjusting the wiper frame in thedesired vertical position with respect to the coating pot 10, preferablyby providing levelling screws 35 which are threaded through the Wiperframe members 27 and engage the upper flanged portion 12' of the liner12; and by 'providing bolts 36 connected to the fiange 12,', and nuts 37therefor, which bolts 36 extend through slots 38 provided in the wiperframe members 27. The slots 38 enable the wiper frame to be laterallyadjusted by the adjusting' means 33 34 and to then be clamped inlevelled position by the nuts 37 after the levelling screws -35 havebeen set atthe desired place.

A wiper roll 39 is journaled at 40 in the frame members 31 and acarriage 41 is slidably mounted et 42 in the frame members 31.v Another`wiper roll 43 is journaled on a shaft 44 carried by the carriage 41, andthe roll 43 may be moved toward and away from the roll 39 by theoperating means 45, throughthe' gear 46 and gears 47 threaded on thescrews 48, which are connected at 49 to the carriage 4l.

Each wiper roll 39 and 43 is provided with a plurality of longitudinallyextending rib members.

50, and as best shown in Figs. 3 and 5, rotation of the wiper rolls 89and 43 in one direction is prevented by the pawl or' catch members 51,which engage one of the Wiper members 52h,

which are preferably provided with longitudinally extendingA groovesinterengaging-with the ribs 50, and arelongitudinally slidably removablymount ed on the ribs 50 of the wiper rolls 39 and 43. The wiper members52, 52a and 52h are-provided with removable wiper pads 53, madepreferably of asbestos.

In the operation of the improved apparatus, the strip S movescontinuously through the pot 10, and the wiper apparatus therefor, inthe direction shown by the arrows on the drawings, and passes betweenopposed wiper pads 53 carried by the wiper members 52 on each wiper roll39 and 43. Rotation of the rolls 39 and 43 by the passage of the stripbetween the same is prevented by the pawls 51; while the pressure of thewiper pads 53 upon thesurfaces of the strip Sis adjustedand maintainedby operation of the adjusting means 45.

As the wiper pads 53 carried by the wiper members 52 wear down, theadjusting means 45 may be operated to maintain a uniform pressure on thesurfaces of the strip S, to obtain a uniformly coated product. When itis necessary to change wiper pads, the wiper rolls are rotated by theoperator in a downward direction toward the strip (Fig. 5) so that thewiper pads 53 carried by the wiper members 52a contact with the surfacesof the strip S; and this contact is established just after the contactof the wiper pads 53 carried by the opposed wiper members 52 with thesurfaces of the strip is broken, so that substantially no portion of thestrip will remain unwiped.

When this adjustment has been made, the worn wiper pads 53 carried bythe wiper members 52D will be in the positions indicated by the wipermembers 52h. Thus, in the drawings, the wiper members 52a carry newwiper pads ready for use, the wiper members 52 carry wiper pads in use,and the wiper members 52h carry worn wiper pads 53, which must bechanged.

The wiper members 52h carrying worn wiper pads 53 may then be removedwhen they reach the position shown at 52a' and have their pads `53turned or replaced, and may then be replaced on the rolls 39 and 43 atthe positionsindicated at 52a all during continuous' movement of thestrip S through the wiper apparatus.

Referring to Fig. 7, wherein a double strip wiper apparatus for strips Sis shown, the wiper apparatus preferably includes a wiper frame composedof longitudinal end members 127 and lateral end members 128, boltedtogether as at 129 and 130, and roll frame members 131 and 131a areconnected, to the frame members 128 preferably by bolts 132. Adjustingscrews 33 threaded into the blocks 20a and 2Gb, together with the locknuts 34, provide for the lateral adjustment and clamping of the wiperframe; while the levelling screws 35, bolts 36 extending through theslots-38, and the nuts 37 therefor, provide for the Vertical adjustment,levelling and clamping of the wiper frame.

Wiper rolls 139 are journaled at 140 and 140a in the frame members 131and 131a, and carriages 141 are slidably mounted at 142 in thel framemembers 131 and 131a. Other wiper'rolls 143 are journaled on shafts 144carried by the carriages 141, and the rolls 143 may be moved toward andaway-from the rolls 139 independently of each other by the operatingmeans 145, throughthe'gear .146, and gears 147 threaded on the screws148, which are connected at 149 to the carriages 141.

Each wiper roll 139 and 143-is provided with a plurality oflongitudinally extending rib members 150, and rotation ofthe rollsin'one direction is prevented by the pawls 151, while wiper members 152carrying wiper pads 153 are longitudinally slidably removably mounted onthe ribs 150. The wiper pads 153 are adapted for being replaced in thevsame manner as described in connection with Figs. 3, 4, 5 and 6.

Referring to Fig. 8, wherein a triple strip wiper apparatus for strips Sis shown, the wiper apparatus preferably includes a wiper frame composedof longitudinal end -members 227 and lateral end members 228, togetherwith roll frame members 231 and 231a. The members 227, 228, 231 and 231aare preferably bolted together as by the members 229 and the bolts230,230a and 230D. Adjusting screws 33 threaded into the blocks 20a and2012, together with lock nuts 34 provide for the lateral adjustment andclamping of the wiper frame; while levelling screws 35, bolts 36extending through slots 38, and the nuts 37 therefor, provide for thevertical adjustment, levelling and Aclamping of the wiper frame.

Wiper rolls 239 are journaled at'240 and 240a in the frame members 231and 231a, and carriages 241 are slidably mounted at 242 in the framemembers 241 and 241a. Other wiper rolls 243 are journaled on shafts 244carried. by the carriages 241, and the rolls 243 may be moved toward andaway from the rolls 239, independently of each other, by the operatingmeans 245 comprising screws threaded through one of the frame members228 and connected to the carriages 241 and 249.

Each wiper roll 239 and 243 is provided with a plurality oflongitudinally extending rib members 250, and rotation of the rolls inone direction is prevented by the pawls 2,51, while wiper members 252carrying wiperpads 253 are longitudinally slidably removably mounted onthe ribs 250. The wiper pads. 253 are adapted for being replaced in thesame manner described in connection with Figs. 3, 4, 5 and 6.

Accordingly, the present invention provides wip'er apparatus which maybe utilized for wiping oi excess coating material which may ad#- here tothe surfaces of a strip or strips passing continuously through a moltenbath in a coating pot, immediately after the strip issues from themolten bath, to produce a smooth, even and uniform coating on thesurfaces of the strip, in which the wiper pads may be .changed withoutdelaying or stopping the continuous movement of the strip through the`coating pot and substantially without leaving a section of the stripunwiped; in which the wiper apparatus may be adjusted both verticallyand horizontally with respect to the coating pot; and in which thepressure exerted by the wiper pads upon the surfaces of the strippassingtherebetween may be controlled. i

1. Continuous coating wiper apparatus for ahot coating pot, including aframe, a plurality of wiper rolls rotatably mounted on the frame, aplurality of wiper pads removably mounted on each roll, and meanspreventing rotation of each roll in one direction. l

2. Continuous coating wiper apparatus for a. hot coating'fpoulincludinga frame, means for adjusting the location of the frame with respect tothe pot, a plurality of wiper rolls rotatably mounted on the frame, aplurality of wiper pads 150 removably mounted on each roll, and meanspreventing rotation of each roll in onedirection.

3. Continuousv coating wiper apparatus for a hot coating pot, includinga frame, means for levelling and clamping the frame on the coating pot,means for horizontally adjusting and clamping the frame on the coatingpot, a plurality of wiper rolls rotatably mounted on the frame, aplurality of wiper pads removably mounted on each roll, and meanspreventing rotation of each roll in one direction.

4. Continuous coating wiper apparatus for a hot coating pot, including aframe, two wiper rolls rotatably mounted on the frame, a plurality ofwiper pads removably mounted on each roll, means preventing rotation ofeach roll in one direction, and means for moving one of the rolls towardand away from the other roll.

5. Continuous coating wiper apparatus for a hot coating pot, including aframe, a wiper roll journaled in the frame, a carriage mounted in theframe, a second wiper roll journaled in said Carriage, a plurality ofwiper pads removably mounted on each roll, and means preventing rotationof each roll in one direction.

6. Continuous coating wiper apparatus for a hot coating pot, including aframe, a wiper roll journaled in the frame, a carriage mounted in theframe, a second wiper roll journaled in said carriage, a plurality ofwiper pads removably mounted on each roll, means preventing rotation' ofeach roll in one direction, and means for moving the carriage toward andaway from the first mentioned roll.

7. Continuous coating wiper apparatus fora hot coating pot, including aframe, a plurality of wiper rolls rotatably mounted on the frame, aplurality of wiper members removably mounted on each roll, a wiper padremovably mounted on each w-iper member, and means preventing rotationof each roll in one direction.

8. Continuous coating wiper apparatus for a hot coating pot, including aframe, a plurality of wiper rolls rotatably mounted on the frame, eachof said wiper rolls being provided with a plurality of rib members,wiper members removably mounted on said rib members, a wiper pad mountedon each wiper member, and means preventing rotation of each roll in onedirection.

9. Continuous coating wiper apparatus for a hot coating pot, including aframe, a plurality of Wiper rolls rotatably mounted von the frame, eachof said wiper rolls being provided with a plurality of rib members,wiper members for said rib members, said wiper and rib members beingprovided with interengaging means removably mounting the wiper memberson the rib members, a removable wiper pad carried by each wiper member,and means preventing rotation of each roll in one direction.

10. Continuous coating Wiper apparatus for a hot coating pot, includingaframe, a plurality of wiper rolls rotatably mounted on the frame, eachof said wiper rolls being provided with a plurality ofl longitudinallyextending rib members, wiper members for said rib members, said wiperand rib members being provided with interengaging means longitudinallyslidably removably mounting the wiper members on the rib members,

a wiper pad carried by each wiper member, and means preventing rotationof each roll in one direction.

11. Continuous coating wiper apparatus for a hot coating pot, includinga frame, a plurality of wiper rolls rotatably mounted on the frame, aplurality of wiper members for each wiper roll, interengaging meansremovably mounted each wiper member on the wiper rolls, a removablewiper pad carried by each wiper member, and means preventing rotation`of each roll in one direction.

12. Continuous coating wiper apparatus for a hot coating pot, includinga frame, means for levelling and clamping the frame on the coating pot,means for horizontally adjusting and clamping the frame on the coatingpot, a Wiper roll journaled in the frame, a movable carriage mounted inthe frame, a second wiper roll journaled in said carriage, each of saidwiper rolls being provided with a plurality of rib members, wipermembers for sa-id rib members, said Wiper and rib members being providedwith interengaging means removably mounting the wipermembers on the ribmembers, a removable wiper pad carried by each wiper member, meanspreventing rotation of each wiper roll in one direction, and means foradjusting .said carriage toward and away from the rst mentioned wiperroll.

13. Continuous coating wiper apparatus for a hot coating pot, includinga frame, a plurality of sets of wiper rolls rotatably mounted on theframe, a plurality of wiper pads removably mounted on each roll, andmeans preventing rotation of each roll in one direction.

14. Continuouscoatingy wiper apparatus for a hot coating pot, includinga frame, means for adjusting the locati/on of the frame with respect tothe pot, a plurality of sets of wiper rolls rotatably mounted on theframe, a plurality of wiper pads removably mounted on each roll, andmeans preventing rotation of each roll in one direction.

15. Continuous coating wiper apparatus for a hot coating pot, includinga frame, a plurality of sets of wiper rolls rotatably mounted on theframe, a plurality of wiper pads removably mounted on each roll, meanspreventing rotation of each roll in one direction, and means forindependently adjusting one roll of each set toward and away from theother roll of each set.

16. Continuous coating wiper apparatus for a hot coating pot, includinga frame, a plurality of wiper rolls journaled in the frame, a pluralityof carriages mounted in the frame one adjacent to each roll, a wiperroll journaled in each carriage, a plurality of y wiper pads removablymounted on each roll, and means preventing rotation of each roll in onedirection.

17. Continuous coating wiper vapparatus for a hot coating pot, includinga frame, a plurality of wiper rolls journaled inthe frame, a pluralityof carriages mounted in the frame one for each wiper roll, a wiper rolljournaled in each carriage, a plurality of wiper pads removably mountedon each roll, means preventing rotation of each roll in one direction,and means for inm dependently adjusting each carriage toward and awayfrom its adjacent wiper roll.

ROBERT F. RENKIN.

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